[Copilot]

Fixes #65387

Analysis

For projects without a package.json, ancestor lookup paths can produce a recursive watch on /Users. Watch-root grouping protects Windows and Linux home directories but omits macOS.

Fix

• Watch roots: Group /Users/<user> as one logical component, matching the existing home-directory safeguard.
• Regression coverage: Verify that /Users and the user’s home directory are excluded while project and sibling-directory watches remain intact.

Copilot Checklist

I successfully ran the applicable command at the end of my session, and it completed without error:

• npx hereby validate
• npx hereby validate --api (for TypeScript API changes)

• Fixes LSP registers a recursive watch on /Users for projects without a package.json on macOS #65387

[Jake Bailey (jakebailey)]

Yes, exactly this

[Copilot]

🟡 Changes recommended

The macOS path check still permits a recursive /users watch on case-insensitive filesystems because it compares original casing, and the existing tests do not cover lowercase paths.

1 open issue

• Use case-insensitive matching for macOS user paths · New

What changed in this PR

This PR addresses #65387 by extending the language server’s watch-root safeguards to macOS home directories, preventing overly broad recursive watches.

Changes:

• Group /Users/<user> as one logical path component, matching existing home-directory safeguards.
• Add regression coverage for excluding home roots while preserving project and sibling-directory watches.

File	Description
tsc/​internal/​project/​watch.go	Adds macOS home-directory grouping to watch-root selection.
tsc/​internal/​project/​watch_test.go	Tests path grouping and watcher filtering under both case-sensitivity modes.

_{Review effort: Balanced}

[Copilot]

🟢 Approval recommended

There are no active review issues for the macOS home-directory watch safeguard changes.

No open issues 🎉

1 resolved since last review

• Use case-insensitive matching for macOS user paths

_{Review effort: Balanced}